The BECN1 Knockout HAP1 Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal population of human near-haploid HAP1 cells, engineered for loss-of-function studies of the BECN1 gene. This product provides a heterogeneous pool of knockout cells generated by CRISPR/Cas9-mediated disruption of the target gene, without selection for single-cell clonality, enabling robust assessments of gene function in a genetically amenable host. It is designed to serve as a versatile tool for investigating autophagy regulation, apoptosis crosstalk, and associated signaling networks in a reductionist haploid background.
The HAP1 cell line is a male-derived, near-haploid adherent cell line from a chronic myeloid leukemia (CML) patient. Its haploid karyotype enables efficient gene knockout, as a single mutation can produce a functional null genotype without homologous chromosome compensation. The hematopoietic lineage and CML origin provide a model for oncogenic signaling, while stable adherent growth supports high-resolution imaging and scalable workflows, making it ideal for dissecting autophagy-dependent processes in normal and malignant hematopoiesis.
BECN1 encodes Beclin-1, a scaffold protein essential for initiating autophagosome formation as a core component of the class III PI3K complex. Together with PIK3C3/VPS34, PIK3R4/VPS15, and regulatory subunits ATG14, UVRAG, and AMBRA1, it generates phosphatidylinositol 3-phosphate (PI3P), which recruits WIPI1 and WIPI2 to nucleate and expand the isolation membrane. Beclin-1 is negatively regulated by mTORC1 phosphorylation and interactions with BCL-2 and BCL-XL, and activated by AMPK, DAPK, JNK1, nutrient deprivation, or hypoxia. This integration of signals positions Beclin-1 at the crossroads of autophagy, apoptosis, and PI3K/AKT/mTOR signaling, with additional roles in endocytosis and inflammatory signaling via interactions with Rubicon and HMGB1.
Characterization of BECN1 knockout in HAP1 cells permits the dissection of autophagy-dependent and -independent functions in a genetically clean system. The haploid background ensures efficient gene disruption, minimizing interpretive complexities arising from residual gene copies. This model is particularly suited for studying how loss of Beclin-1 affects PI3P production, autophagic flux, and apoptotic thresholds under stress conditions such as nutrient deprivation or chemotherapy exposure. Given the involvement of BECN1 in cancers of the breast, ovary, and prostate, as well as neurodegenerative pathologies and viral infections, the HAP1 BECN1 knockout tools enable translational investigations into mechanisms of drug resistance, tumor metabolism, and host?Cpathogen interactions.
Researchers can employ these polyclonal knockout cells in a wide range of experimental contexts. Typical assays include monitoring autophagic flux via LC3B lipidation (LC3-II) and p62/SQSTM1 turnover by immunoblotting, visualization of GFP-LC3 puncta by fluorescence microscopy, and co-immunoprecipitation of Beclin-1 interactors. Functional studies can assess cell viability under amino acid or serum starvation, sensitivity to PI3K inhibitors or DNA-damaging agents, and apoptosis induction monitored by Annexin V/propidium iodide flow cytometry. The cells are also suitable for high-throughput screening and synthetic lethality screens against existing cancer therapeutics. For additional information or technical support, please contact Ascent Research.
